Harbury, C. (1982). Workbook in Introductory Economics (Third Edition). ELSEVIER.
Čikaški stil citiranja (17. izdanje)Harbury, Colin. Workbook in Introductory Economics (Third Edition). ELSEVIER, 1982.
MLA način citiranja (8. izdanje)Harbury, Colin. Workbook in Introductory Economics (Third Edition). ELSEVIER, 1982.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.